KR100493900B1 - Method for Sharing Rights Object Between Users - Google Patents

Method for Sharing Rights Object Between Users Download PDF

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Publication number
KR100493900B1
KR100493900B1 KR10-2003-0057901A KR20030057901A KR100493900B1 KR 100493900 B1 KR100493900 B1 KR 100493900B1 KR 20030057901 A KR20030057901 A KR 20030057901A KR 100493900 B1 KR100493900 B1 KR 100493900B1
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South Korea
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information
authority information
user terminal
user
authority
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KR10-2003-0057901A
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Korean (ko)
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KR20050020165A (en
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이병래
장경아
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삼성전자주식회사
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Priority to KR10-2003-0057901A priority Critical patent/KR100493900B1/en
Priority to JP2004222127A priority patent/JP4694800B2/en
Priority to MYPI20043142A priority patent/MY136409A/en
Priority to TW093123444A priority patent/TWI244313B/en
Priority to SG200404786A priority patent/SG109593A1/en
Priority to AT04255020T priority patent/ATE357106T1/en
Priority to DE602004005277T priority patent/DE602004005277T2/en
Priority to US10/922,021 priority patent/US7734917B2/en
Priority to DE602004018143T priority patent/DE602004018143D1/en
Priority to ES04255020T priority patent/ES2282811T3/en
Priority to CN2004100569165A priority patent/CN1585324B/en
Priority to PT04255020T priority patent/PT1509024E/en
Priority to EP04255020A priority patent/EP1509024B1/en
Priority to EP06000766A priority patent/EP1646204B1/en
Priority to RU2004125545/09A priority patent/RU2295157C2/en
Priority to PL04255020T priority patent/PL1509024T3/en
Priority to DK04255020T priority patent/DK1509024T3/en
Publication of KR20050020165A publication Critical patent/KR20050020165A/en
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Publication of KR100493900B1 publication Critical patent/KR100493900B1/en
Priority to HK05105251.8A priority patent/HK1072667A1/en
Priority to US12/579,034 priority patent/US8316461B2/en
Priority to JP2010293033A priority patent/JP5249314B2/en

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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F17/00—Digital computing or data processing equipment or methods, specially adapted for specific functions
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L63/00—Network architectures or network communication protocols for network security
    • H04L63/12—Applying verification of the received information
    • H04L63/123—Applying verification of the received information received data contents, e.g. message integrity
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F21/00—Security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
    • G06F21/10—Protecting distributed programs or content, e.g. vending or licensing of copyrighted material ; Digital rights management [DRM]
    • G06F21/107—License processing; Key processing
    • G06F21/1075—Editing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L63/00—Network architectures or network communication protocols for network security
    • H04L63/04—Network architectures or network communication protocols for network security for providing a confidential data exchange among entities communicating through data packet networks
    • H04L63/0428—Network architectures or network communication protocols for network security for providing a confidential data exchange among entities communicating through data packet networks wherein the data content is protected, e.g. by encrypting or encapsulating the payload
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L63/00—Network architectures or network communication protocols for network security
    • H04L63/04—Network architectures or network communication protocols for network security for providing a confidential data exchange among entities communicating through data packet networks
    • H04L63/0428—Network architectures or network communication protocols for network security for providing a confidential data exchange among entities communicating through data packet networks wherein the data content is protected, e.g. by encrypting or encapsulating the payload
    • H04L63/0442—Network architectures or network communication protocols for network security for providing a confidential data exchange among entities communicating through data packet networks wherein the data content is protected, e.g. by encrypting or encapsulating the payload wherein the sending and receiving network entities apply asymmetric encryption, i.e. different keys for encryption and decryption
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L63/00—Network architectures or network communication protocols for network security
    • H04L63/10—Network architectures or network communication protocols for network security for controlling access to devices or network resources
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L2463/00—Additional details relating to network architectures or network communication protocols for network security covered by H04L63/00
    • H04L2463/101—Additional details relating to network architectures or network communication protocols for network security covered by H04L63/00 applying security measures for digital rights management

Abstract

Provided is a method for delivering all or part of a rights object (RO) of a user associated with digital content to other users. The method includes creating a rights object to be transmitted to a second user within a limit of a rights object held by the first user, and forwarding the created rights object to the second user. The method allows each user to share its own RO with other users within the limit of the RO without server authentication.

Description

사용자간 콘텐츠에 대한 권한정보의 공유방법{Method for Sharing Rights Object Between Users}How to share rights information on content among users {Method for Sharing Rights Object Between Users}

본 발명은 콘텐츠에 대한 사용자의 권한정보의 일부 또는 전부를 사용자에게 전달하는 방법에 관한 것이다.The present invention relates to a method of delivering a part or all of a user's authority information for content to a user.

현재 무선 인터넷 기술과 무선 통신 기술은 급속도로 발전하고 있다. 최근에는 멀티미디어 기능이 강화된 휴대용 단말기의 보급이 일반화되고 있다. 과거에는 단음이던 휴대폰의 벨소리가 점차 16화음에서 40화음의 벨소리로 변화하고 있으며, 최근에는 64화음의 벨소리를 갖는 휴대용 단말기가 등장하고 있다. 또한 디지털 카메라 기능을 포함한 휴대용 단말기의 보급도 폭발적으로 증가하는 추세에 있다. 멀티미디어 기능이 강화된 휴대용 단말기의 보급과 더블어 이를 위한 콘텐츠 제공과 관련한 분야들이 발전하고 있다. 그리고 벨 소리 다운로드나 통화 대기음, 연애인이나 캐릭터 사진 혹은 그림, 또는 영화나 스포츠 등의 동영상 등의 콘텐츠 서비스를 제공하는 많은 회사들이 생겨나고 있다. 이러한 콘텐츠 서비스는 점차 유료 서비스로 바뀌어가고 있는 추세이며, 콘텐츠 서비스를 제공하는 여러 회사들은 초기에는 복제 방지 기술을 기반으로 콘텐츠 서비스를 제공하였다. 그러나 최근에는 점차 사용자의 권한정보(Rights Object; 이하, RO라 함)에 대한 유연성 및 편리성을 기반으로 한 디지털 저작권 관리(Digital Rights Management; 이하, DRM이라 함)가 점차로 도입되고 있다.At present, wireless Internet technology and wireless communication technology are rapidly developing. Recently, the spread of portable terminals with enhanced multimedia functions has become commonplace. In the past, the ringtone of a mobile phone, which was a single tone, is gradually changing from a 16th chord to a 40th chord, and recently a portable terminal having a 64th chord has been introduced. In addition, the spread of portable terminals including digital camera function is also exploding. Fields related to the diffusion of portable terminals with enhanced multimedia functions and the provision of contents for double access have been developed. In addition, many companies are emerging to provide content services such as ringtone downloads, call waiting sounds, lovers or character photographs or pictures, or movies such as movies and sports. Such content services are gradually being turned into paid services, and many companies that provide content services initially provided content services based on copy protection technology. Recently, however, digital rights management (hereinafter referred to as DRM) based on flexibility and convenience of user rights information (hereinafter referred to as RO) is gradually introduced.

DRM 기술은 기본적으로 사용자들간 암호화된 콘텐츠의 분배는 자유롭게 허용하고 있으나, 해당 콘텐츠를 실행하려면 권한정보를 구입한 이후에 가능하도록 제어하고 있다. 콘텐츠 분배의 자유는 이용해본 콘텐츠가 마음에 드는 경우에 사용자가 이를 친구나 연인 등에게 전송할 수 있게 하는 장점이 있다. 콘텐츠의 자유로운 분배는 양질의 콘텐츠의 이용을 확산시키며 사용자에 의한 콘텐츠의 유통과 광고의 효과를 가져오는 효과가 있다. 한편, 암호화된 콘텐츠의 수신자는 콘텐츠를 실행시키기 위해서는 권한정보를 필요로 한다. 즉, 다른 사용자로부터 암호화된 콘텐츠를 수신하더라도 권한정보를 구입하지 않으면 이를 실행시킬 수 없게 된다.DRM technology basically allows the distribution of encrypted content among users freely. However, in order to execute the content, the DRM technology controls the content after purchasing the authorization information. The freedom of content distribution has the advantage of allowing the user to send it to a friend or a lover when the content is used. The free distribution of content spreads the use of high quality content and has the effect of circulating content and advertising by users. On the other hand, the recipient of the encrypted content needs the authority information to execute the content. That is, even if the encrypted content is received from another user, it cannot be executed unless the authorization information is purchased.

도 1은 종전에 DRM 콘텐츠 분배의 과정을 보여주는 도면이다.1 is a diagram illustrating a process of DRM content distribution.

사용자(200)는 콘텐츠 제공자(300)가 제공하는 암호화된 콘텐츠를 받아 이를 실행시킨다. 암호화된 콘텐츠는 전송 및 배포가 자유로이 허용되나 이를 실행시키기 위해서는 권한정보가 필요하다. 실행을 위하여 사용자 1(200)은 권한정보 발행기관(100)으로부터 권한정보를 요청하면(구입하면) 권한정보 발행기관(100)은 요청된(구입한) 한도의 권한정보를 사용자 1(200)에게 전송한다. 권한정보를 가진 사용자는 콘텐츠를 실행하여 콘텐츠에 담겨있는 멀티미디어 정보를 즐길 수 있다.The user 200 receives and executes the encrypted content provided by the content provider 300. Encrypted content can be freely transmitted and distributed, but requires authorization information to execute it. In order to execute, the user 1 200 requests (purchases) the authority information from the authority information issuing authority 100, and the authority information issuing authority 100 receives the authority information of the requested (purchased) limit. Send to. A user with the authority information can execute the content and enjoy the multimedia information contained in the content.

사용자 1(200)이 콘텐츠를 실행시켜본 결과 만족했다면 사용자 1(200)은 콘텐츠를 친한 친구인 사용자 2(200)와 함께 공유하고자 하고 사용자 2(200)에게 콘텐츠를 전송한다. 사용자 2(200)는 사용자 1(200)로부터 받은 콘텐츠를 실행하고자 하나 암호화되어 있는 콘텐츠이므로 자신이 이를 실행시킬 수 있는 권한정보가 있는 경우에만 실행시킬 수 있다. 만일 권한정보가 없는 경우에는 권한정보 발행기관(100)에 권한정보를 요청하고 권한정보 발행기관(100)으로부터 권한정보를 전송받아 콘텐츠를 실행시킬 수 있다. 한편, 사용자 1(200)은 사용자 2(200)에 콘텐츠를 전송하기도 하지만 사용자 2(200)는 콘텐츠 제공자(300)로부터 콘텐츠를 직접 전송받을 수 있다.If the user 1 200 is satisfied with the result of executing the content, the user 1 200 tries to share the content with the user 2 200, a close friend, and transmits the content to the user 2 200. User 2 (200) wants to execute the content received from User 1 (200) but is encrypted content and can be executed only if the user has the authority information to execute it. If there is no authority information, the authority information issuer 100 may request authority information and receive the authority information from the authority information issuer 100 to execute content. Meanwhile, although the user 1 200 may transmit content to the user 2 200, the user 2 200 may receive the content directly from the content provider 300.

이와 같은 종전의 서비스의 이용자는 자신이 구입한 콘텐츠를 실행시킬 수 있는 권한정보를 다른 사용자와 공유하기를 원하지만 도 1의 서비스는 이러한 기능을 제공하지 못한다. 이러한 점 때문에 일본국 특개2003-58657은 다음과 같은 과정에 따라 콘텐츠에 대한 라이센스를 다른 사용자가 사용할 수 있도록 한다.The user of such a previous service wants to share the authority information for executing the content he purchased with other users, but the service of FIG. 1 does not provide such a function. For this reason, Japanese Patent Laid-Open No. 2003-58657 allows another user to use a license for the content according to the following procedure.

1. 유저 또는 단말마다 콘텐츠에 대한 라이센스 정보를 라이센스 정보 데이터베이스의 개별 영역에 저장한다.1. For each user or terminal, license information of the content is stored in a separate area of the license information database.

2. 양도인으로부터 이전 요구를 받는다면, 암호 키를 생성하고, 그 암호 키를 이용하여 양도 대상 라이센스 정보를 암호화하고 개별 영역으로부터 공개 영역으로 이동시키는 것과 동시에 그 암호 키를 양도인에게 발행한다.2. Upon receipt of the transfer request from the assignor, generate an encryption key, use the encryption key to encrypt the licensed license information and move it from the individual area to the public area and issue the encryption key to the assignor.

3. 발행한 암호 키는 양도인에게서 양수인에게 전달한다.3. The issued encryption key shall be transferred from the assignor to the assignee.

4. 피양도인으로부터 라이센스 이전 요구를 받으면 양도인에게 발행한 암호 키를 소유하고 있는지 여부를 가지고 피양도인을 인증한다.4. Upon receiving a license transfer request from the assignee, certify the assignee with or without possession of the cryptographic key issued to the assignee.

5. 피양도인이 인증된 경우에는 양도 대상 라이센스 정보를 암호 키로 복호화하고 공개 영역으로부터 피양도인의 개별 영역으로 이동시킨다.5. If the assignee is authenticated, the transferred license information is decrypted with an encryption key and moved from the public domain to the individual territory of the assignee.

상기의 과정에 따라 콘텐츠를 실행시킬 수 있는 라이센스를 가진 사용자는 이를 다른 사용자에게 이전할 수 있게 된다. 즉, 상기의 방법을 통해 사용자는 자신이 갖고 있는 콘텐츠에 대한 라이센스를 다른 사용자도 이용하게 할 수 있다.According to the above process, a user with a license to execute content can transfer it to another user. That is, the above method allows the user to use the license for the content that the user has to other users.

그러나 상기 종전의 발명의 경우에는 콘텐츠를 제공자와 콘텐츠를 실행할 수 있는 라이센스를 동일한 서버에서 관리하는 것으로 예정하고 있으므로 라이센스 정보는 서버에만 존재한다. 즉, 사용자간에 라이센스를 공유하기 위해서는 반드시 서버의 관여가 필요하다. 또한, 라이센스의 이전을 위해서 서버의 사전 인증 과정을 거친다. 즉, 양도인이 콘텐츠에 대한 라이센스를 양수인에게 양도하기 위해서는 먼저 서버에 양도를 신청하고 암호키를 받아서 이를 다시 양수인에게 전달하고 양수인은 암호키를 통해 인증을 받은 후에 콘텐츠를 사용하는 번잡한 과정을 거쳐야 한다.However, in the case of the foregoing invention, since the content is planned to be managed by the same server with the provider and the license to execute the content, the license information exists only on the server. In other words, the server must be involved in order to share a license among users. In addition, the server undergoes a pre-authentication process for license transfer. In other words, in order for the assignor to transfer the license for the content to the assignee, he or she must first apply for the transfer to the server, receive the encryption key, pass it back to the assignee, and the assignee must go through a complicated process of using the content after authenticating through the encryption key. do.

따라서, 본 발명은 콘텐츠를 실행하기 위한 권한정보를 사용자간 자유롭게 전달하여 공유할 수 있는 방법을 제공하는 것을 그 기술적 과제로 한다.Accordingly, the present invention provides a method for freely transferring and sharing authority information for executing content among users.

상기 목적을 달성하기 위하여, 본 발명에 따른 사용자간 콘텐츠에 대한 권한정보의 공유방법은 제1 사용자가 자신이 소유한 권한 정보의 한도 내에서 제2 사용자에게 전달할 권한정보를 생성하는 단계와, 상기 생성된 권한정보를 제2 사용자에게 전송하는 단계를 포함한다. 상기 권한정보는 위조 또는 변조를 방지하기 위하여 제1 사용자의 비밀키를 이용하여 전자서명을 하고 제2 사용자에게 전송하는 것이 바람직하다. 또한 상기 권한정보는 제3자에 의한 불법적인 이용을 방지하기 위하여 제2 소유자의 공개키를 이용하여 암호화해서 전송하는 것이 바람직하다. 한편, 권한정보가 부정한 목적으로 중복하여 사용되지 않도록 상기 제1 소유자 및 제2 소유자는 권한정보 발행기관에 권한정보의 한도에 대한 정보를 소정의 기간마다 전송하는 것이 바람직하다.In order to achieve the above object, according to the present invention, a method of sharing authority information on content between users includes: generating authority information to be delivered to a second user by a first user within a limit of authority information owned by the first user; And transmitting the generated authority information to the second user. In order to prevent forgery or tampering, the authority information is preferably digitally signed using the secret key of the first user and transmitted to the second user. In addition, the authority information is preferably encrypted and transmitted using the public key of the second owner in order to prevent illegal use by a third party. On the other hand, it is preferable that the first owner and the second owner transmit the information on the limit of the authority information to the authority information issuing authority every predetermined period so that the authority information is not repeatedly used for an illegal purpose.

사용자의 권한정보를 백업서버에 백업하도록 하여 사용자의 휴대용 단말기의 분실 또는 고장의 경우를 대비하거나 휴대용 단말기의 프로세싱 부하를 줄이는 데 사용할 수 있다.By backing up the user's authority information to a backup server, it can be used in case of loss or failure of the user's portable terminal or to reduce the processing load of the portable terminal.

이하, 첨부된 도면을 참조하여 본 발명의 바람직한 실시예를 상세히 설명한다.Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

도 2는 본 발명의 일 실시예에 따라 DRM 콘텐츠를 실행할 수 있는 권한정보를 생성하여 분배하는 과정을 보여주는 도면이다.2 is a diagram illustrating a process of generating and distributing authority information for executing DRM content according to an embodiment of the present invention.

사용자 1(200)은 권한정보 발행기관으로부터 발급받은 권한정보를 소유하고 있다. 현재 소유하고 있는 권한정보의 내용은 암화화된 콘텐츠를 재생시킬 수 있는 재생권한이고 재생횟수는 10회로 제한되어 있다. 이 때 사용자 1(200)이 다른 친구인 사용자 2(200) 및 사용자 3(200)도 암호화된 콘텐츠를 재생시키기를 바란다. 이 때 사용자 1(200)은 자신이 암호화된 콘텐츠를 재생시킬 수 있는 재생권한을 갖고 있는 권한정보를 다른 친구와 공유함으로써 이러한 목적을 달성할 수 있다. 즉, 사용자 1(200)은 자신이 갖고 있는 재생권한 10회짜리 권한정보를 바탕으로 재생권한 5회짜리 권한정보와 재생권한 3회짜리 권한정보를 생성한다. 재생권한 5회짜리 권한정보와 재생권한 3회짜리 권한정보를 생성한 사용자 1(200)의 권한정보의 재생권한은 2회가 된다. 생성된 권한정보는 각각 사용자 2(200)와 사용자 3(200)에게 전송한다. 바람직한 실시예에 있어서, 상기 권한정보는 수신자(사용자 2 또는 사용자 3)의 공개키로 암호화하여 전송한다. 즉, 사용자 2(200)에게는 사용자 2(200)의 공개키로 재생권한 5회짜리 권한정보를 암호화하여 사용자 2(200)에게 전송하고, 사용자 3(200)에게는 사용자 3(200)의 공개키로 재생권한 3회짜리를 권한정보를 암호화하여 사용자 3(200)에게 전송한다. 권한정보를 전송받은 사용자 2(200) 및 사용자 3(200)은 자신의 비밀키를 이용하여 각자 전송받은 암호화된 권한정보를 해독한다. 암호화된 권한정보를 전송함으로써 불법적인 제3자가 권한정보를 이용하는 것을 방지할 수 있다. 바람직한 실시예에 있어서, 상기 권한정보는 발신자(사용자 1)의 비밀키로 전자서명하여 전송한다. 사용자 1(200)이 전자서명하여 권한정보를 사용자 2 또는 사용자 3(200)에게 전송함으로써 위조나 변조 및 송신측의 전송 부인을 예방할 수 있다.User 1 (200) owns the authority information issued from the authority information issuing agency. The contents of the authority information currently owned are the reproduction authority for playing the encrypted content, and the number of reproduction is limited to 10 times. At this time, it is desired that User 1 200 and other friends, User 2 200 and User 3 200, also play the encrypted content. At this time, the user 1 (200) can achieve this purpose by sharing the authority information that has the authority to play the content that is encrypted with other friends. That is, the user 1 200 generates five rights rights of reproduction rights and three rights rights of reproduction rights based on the 10 times rights information of the reproduction rights he has. The reproduction authority of the authority information of the user 1 (200), which has generated the reproduction authority five times and the reproduction authority three times, is two times. The generated authority information is transmitted to the user 2 200 and the user 3 200, respectively. In a preferred embodiment, the authorization information is transmitted by encrypting with the public key of the receiver (User 2 or User 3). That is, the user 2 200 encrypts the authority information of five times of playing authority with the public key of the user 2 200 and transmits it to the user 2 200, and the user 3 200 plays with the public key of the user 3 200. The authority information is encrypted three times and transmitted to the user 3 (200). The user 2 (200) and the user 3 (200) received the authority information decrypts the encrypted authority information respectively transmitted using their private keys. By transmitting the encrypted authority information, an illegal third party can be prevented from using the authority information. In a preferred embodiment, the authority information is digitally signed by the sender (user 1) secret key and transmitted. User 1 200 may digitally sign and transmit the authority information to User 2 or User 3 200 to prevent forgery, tampering, and transmission denial of the sender.

한편, 사용자 3(200)이 암호화된 콘텐츠를 사용자 1(200)로부터 전송받은 권한정보를 이용하여 재생시켜보고 만족하였고, 사용자 4(200)도 같은 콘텐츠를 재생시키기를 원한다면 현재 자신이 소유하고 있는 재생권한 2회짜리 권한정보를 바탕으로 사용자 4(200)에게 전송할 재생권한 1회짜리 권한정보를 생성하여 이를 사용자 4(200)에게 전송한다. 이러한 경우에도 전송하고자 하는 권한정보는 전자서명 및 암호화를 거친 후에 전송한다.On the other hand, if user 3 (200) plays the encrypted content using the authority information received from user 1 (200) and is satisfied, and user 4 (200) wants to play the same content, he currently owns it. On the basis of the two-times authority information, the reproduction authority one-time authority information to be transmitted to the user 4 (200) is generated and transmitted to the user 4 (200). Even in this case, the authority information to be transmitted is transmitted after digital signature and encryption.

본 발명에서 권한정보는 상기 설명에서와 같은 재생권한 횟수에 한정되지 않는다. 예를 들면 재생시간 등의 경우에도 권한정보에 포함될 수 있고 이러한 경우에 재생시간을 나누어서 권한정보를 생성하는 것도 본 발명의 기술적 사상에 포함되는 것으로 해석하여야 한다.In the present invention, the authority information is not limited to the number of reproduction authority as in the above description. For example, the reproduction time may be included in the authority information, and in this case, the generation of the authority information by dividing the reproduction time should be interpreted as being included in the technical idea of the present invention.

도 3a와 도 3b는 각각 도 2의 권한정보의 문서 형식과 구조의 일례를 보여주는 도면이다.3A and 3B are diagrams each showing an example of a document format and a structure of the authority information of FIG. 2.

먼저 도 3a를 참조하면 <rights>에는 <uid>와 <KeyValue>를 포함하며, <uid>에는 권한정보의 콘텐츠 아이디(Contents Object ID, cid) 값이 기록된다. 한편 <KeyValue>에는 콘텐츠를 암호화한 키 값이 저장된다. <permission>에는 <play>, <copy>, <move> 등의 다양한 허가사항이 있고, 각각의 허가사항은 <constraint>에 의한 제한을 받는다. 예를 들면 <play>에서 <constraint>는 허가사항의 실행횟수를 의미는 <count>나, 재생시간을 의미하는 <duration>, 또는 재생만료시간을 의미하는 <datetime> 등이 될 수 있다. 도 3a의 경우에는 재생권한 10회이다.First, referring to FIG. 3A, <rights> includes <uid> and <KeyValue>, and in <uid>, a Contents Object ID (cid) value of authority information is recorded. <KeyValue>, on the other hand, stores the key value encrypted content. <permission> has various permissions such as <play>, <copy>, and <move>. Each permission is restricted by <constraint>. For example, in <play>, <constraint> may be <count>, which means the execution count of permission, <duration>, which means playback time, or <datetime>, which means playback expiry time. In the case of Fig. 3A, the reproduction authority is 10 times.

도 3b는 이러한 권한정보의 구조를 보여주는 일례이다.3B is an example showing the structure of such authority information.

권한정보는 제약정보와, 메타데이터 정보, 허가사항, 및 권한정보 발행기관 서명 등을 포함한다. 제약정보는 권한정보 아이디나 키 값 등을 포함하고 있으며, 메타데이터정보는 권한정보의 버전과 발행기관 등의 정보를 포함한다. 한편, 허가사항은 재생, 복사, 이동 등의 여러 가지 허가사항을 포함한다. 마지막으로 권한정보 발행기관의 서명은 해당 권한정보가 누구에 의해 생성되었는지를 알려준다.The authorization information includes constraint information, metadata information, permission information, and signature of the authority information issuer. The constraint information includes an authorization information ID or a key value, and the metadata information includes information such as the version of the authorization information and the issuer. On the other hand, the permission includes various permission items such as reproduction, copying and moving. Finally, the signature of the authority issuing authority indicates to whom the authority was generated.

도 4a와 도 4b는 각각 다른 사용자를 위하여 생성한 권한정보 수정된 권한정보의 문서형식과, 이들의 구조를 보여주는 도면이다.4A and 4B are diagrams showing the document format of the authority information modified authority information generated for each user and their structure.

먼저 도 4b를 살펴보면, 사용자 A는 권한정보 발행기관이 발행한 권한정보를 갖고 있다. 권한정보에서 허가사항은 재생 10회이다. 사용자 A는 자신의 재생권한의 5회를 사용자 B에게 이동시키려고 사용자 B를 위해 재생권한 5회의 권한정보를 만든다. 이 때 사용자 A는 권한정보 발행기관에서 발행한 권한정보 이외에 재생권한 10회와 함께 재생권한 5회의 이동이 기록된 권한 정보를 생성하도록 하여 이후 권한정보 발행기관과의 주기적인 정보 전송시 사용자 A에 의해 수정된 사항을 명시하도록 한다. 수정된 권한정보의 메타데이터 정보란에는 사용자 B에게 권한정보를 생성한 것을 기록하고 허가사항에는 이동 5회라는 것을 기록한다. 마지막으로 사용자 A에 의한 수정이라는 것을 표시하기 위하여 사용자 A가 서명한다. 한편, 사용자 B를 위해 생성된 권한정보의 메타데이터 정보란에는 사용자 A로부터 받은 권한정보임을 표시하고 허가 사항은 재생 5회라는 것을 표시한다. 마지막으로 생성자가 사용자 A라는 것을 서명에 의해 표시한다. 사용자 B를 위해 생성된 권한정보는 사용자 B에게 전송되고, 이를 전송받은 사용자 B는 권한정보에 기재된 허가사항의 제한 내에게 콘텐츠에 대한 실행을 할 수 있다.First, referring to FIG. 4B, user A has the authority information issued by the authority information issuing authority. In the authorization information, the permission is 10 replays. User A creates authority information for playback B five times for user B to move user playback 5 times to user B. At this time, user A generates the authority information recorded with the reproduction authority 5 times and the reproduction authority 5 movements in addition to the authority information issued by the authority information issuer. The modifications made should be stated. In the metadata information column of the modified authority information, the user B records the generation of the authority information, and the permission information records the movement five times. Finally, User A signs to indicate that it is a modification by User A. On the other hand, the metadata information column of the authority information generated for the user B indicates that the authority information is received from the user A, and that the permission matter is 5 times of reproduction. Finally, the signature indicates that the constructor is user A. The authority information generated for the user B is transmitted to the user B, and the user B who has received the same can execute the content within the limitation of the permission described in the authority information.

도 4a는 도 4b에서 사용자 B를 위하여 생성한 권한정보 수정된 권한정보의 문서형식과 사용자 A를 위한 수정된 권한정보의 문서형식을 보여준다. 사용자 A의 수정된 권한정보에는 <move>라는 새로운 항목이 생성되고 5회의 재생권한 이동을 기록한다. 이 밖에 사용자 A의 서명과 기타 다른 정보를 포함한다. 한편, 사용자 B를 위해 생성된 권한정보는 재생권한이 5회 있음을 기록하며, 이 밖에 사용자 A의 서명과 기타 다른 정보를 포함한다.FIG. 4A shows the document format of the authority information modified authority information generated for user B in FIG. 4B and the document format of the modified authority information for user A. FIG. In the modified authority information of user A, a new item called <move> is created and five reproduction rights movements are recorded. This includes User A's signature and other information. On the other hand, the authority information generated for user B records that there are five reproduction rights, and also includes user A's signature and other information.

도 5는 본 발명의 다른 실시예에 따라 DRM 콘텐츠를 실행할 수 있는 권한정보를 생성하여 분배하고 이를 관리하는 과정을 보여주는 도면이다.5 is a diagram illustrating a process of generating, distributing and managing authority information for executing DRM content according to another embodiment of the present invention.

사용자 1(200)은 재생권한 10회짜리 권한정보를 갖고 있었고 이를 사용자 2(200) 및 사용자 3(200)을 위한 재생권한 5회 및 3회짜리 권한정보를 각각 생성한 후에 이를 각자에게 전송하였다. 현재 사용자 1(200)이 갖고 있는 재생정보의 횟수는 2회가 되어야 한다. 한편, 사용자 3(200)은 갖고 있는 재생정보 3회짜리 권한정보를 이용하여 사용자 4(200)를 위한 재생정보 1회짜리 권한정보를 생성한 후에 이를 전송하였다. 현재 사용자 3(200)이 갖고 있는 재생정보의 횟수는 2회가 되어야 한다. 그러나 만일 사용자 1(200) 또는 사용자 3(200)이 악의적인 목적을 가지고 소프트웨어 변조 등의 방법으로 자신의 권한정보가 갖고 있는 재생권한의 한도를 넘어서 권한정보를 생성하거나 합법적으로 생성한 하나의 권한정보를 여러 사용자에게 동시에 전송하는 경우가 발생할 수도 있다. 따라서 사용자들(200)은 자신들이 갖고 있는 권한정보의 정보를 소정의 시간마다 권한정보 발행기관(100)에 전송하여 불법적인 권한정보의 사용을 막도록 한다. 예컨대, 권한정보를 생성할 때마다 자신이 갖고 있는 권한정보의 정보를 권한정보 발행기관(100)에 전송하도록 할 수 있으며, 1주일 혹은 보름마다 권한정보 발행기관(100)에 자신이 갖고 있는 권한정보의 정보를 전송하도록 할 수 있다. 상기 권한정보의 정보를 전송하는 시간 간격이 큰 경우에는 사용자가 갖고 있는 권한정보의 한도와 권한정보 발행기관(100)이 갖고 있는 사용자의 권한정보의 한도가 불일치할 수 있다. User 1 (200) had 10 rights of reproduction rights and generated 5 times and 3 times of authority rights for User 2 (200) and User 3 (200), respectively, and sent them to each of them. . The number of pieces of playback information currently owned by user 1 200 should be twice. On the other hand, the user 3 (200) generated and reproduced the one-time authorization information for the user 4 (200) by using the three-time authorization information of the reproduction information it has. The number of pieces of playback information currently owned by user 3 200 should be twice. However, if User 1 (200) or User 3 (200) has a malicious purpose and created a permission or legally generated permission information beyond the limit of the playback permission possessed by the user's permission information through a method such as software tampering, etc. In some cases, information may be sent to multiple users at the same time. Therefore, the users 200 transmit the information of the authority information they have to the authority information issuing authority 100 every predetermined time to prevent illegal use of the authority information. For example, each time the authority information is generated, the authority information may be transmitted to the authority information issuing authority 100, and the authority that the authority information issuing authority 100 has every one week or full time. Information of the information can be transmitted. When the time interval for transmitting the information of the authority information is large, the limit of the authority information possessed by the user and the limit of the authority information of the user possessed by the authority information issuer 100 may be inconsistent.

이는 권한정보의 정보를 권한정보 발행기관(100)에 전송하는 주기와 관련이 있다. 주기를 길게 하면 상대적으로 적은 통신부하가 걸리나 불일치의 가능성이 커지고 주기를 짧게 하면 많은 통신부하가 걸리나 불일치의 가능성은 그만큼 줄어든다.This is related to the period of transmitting the information of the authority information to the authority information issuing authority 100. The longer the cycle, the less the communication load, but the greater the possibility of inconsistency, the shorter the cycle, the greater the communication load, but the less the possibility of mismatch.

상기에서 재생된 권한정보를 전송하기 전에 이를 송신자의 전자서명과 수신자의 공개키로 암호화하는 것이 바람직하다. 한편, 각 사용자(200)는 도 5에 도시된 바와 같이 권한정보 전송과 함께 암호화된 콘텐츠를 서로에게 전송할 수도 있으나, 암호화된 콘텐츠가 있는 곳의 주소 예컨대, URL을 전송할 수도 있다.Before transmitting the authority information reproduced above, it is preferable to encrypt the digital signature of the sender and the public key of the receiver. Meanwhile, as illustrated in FIG. 5, each user 200 may transmit the encrypted contents to each other along with the transmission of the authority information, but may also transmit an address, for example, a URL, where the encrypted contents are located.

도 6은 본 발명의 또 다른 실시예에 따라 DRM 콘텐츠를 실행할 수 있는 권한정보를 생성하여 분배하는 과정을 보여주는 도면이다.6 is a diagram illustrating a process of generating and distributing authority information for executing DRM content according to another embodiment of the present invention.

사용자 1(200)은 자신이 권한정보 발급기관으로부터 발급받은 권한정보를 유선 또는 무선으로 연결된 백업서버에 저장할 수 있다. 백업서버는 도 6에서 볼 수 있듯이 백업서버(400)가 될 수 있다. 권한정보를 백업한 사용자 1(200)은 단말이 고장나거나 단말을 분실한 경우에 상기 백업서버(400)에 자신의 권한정보를 다시 다운받을 수 있다. 한편, 사용자 1(200)은 도 2나 도 5를 통해 설명한 바와 같이 자신이 권한정보를 직접 생성하여 다른 사용자 2 또는 3(200)에 전송할 수도 있지만, 전자서명이나 암호화를 위한 과도한 연산의 부담을 줄이기 위하여 백업서버(400)에서 다른 사용자 2 및 3(200)을 위한 권한정보를 생성한다. 즉 백업서버(400)에 저장되어 있는 사용자 1(200)의 권한정보를 바탕으로 사용자 2 및 3(200)을 위한 각각의 권한정보를 생성한다. 생성된 각각의 권한정보는 전자서명과 암호화를 거친다. 전자서명을 위한 사용자 1(200)의 비밀키와 암호화를 위한 사용자 2와 3(200)의 공개키를 백업서버(400)가 사용자 1 내지 사용자 3(200)으로부터 전송받고 이를 이용하여 각 권한정보에 전자서명하고 암호화한다.User 1 (200) may store the authority information issued from the authority information issuing authority to the backup server connected by wire or wireless. The backup server may be a backup server 400 as shown in FIG. The user 1 200 backing up the authority information may download his authority information back to the backup server 400 when the terminal breaks down or the terminal is lost. On the other hand, the user 1 (200) may generate the authority information directly and transmit it to another user 2 or 3 (200), as described through Fig. 2 or 5, but the burden of excessive operation for digital signature or encryption In order to reduce the backup server 400 generates the authority information for the other users 2 and 3 (200). That is, based on the authority information of the user 1 (200) stored in the backup server 400 generates the respective authority information for the user 2 and 3 (200). Each generated authorization information is subjected to digital signature and encryption. The backup server 400 receives the secret key of the user 1 (200) for the electronic signature and the public keys of the user 2 and 3 (200) for encryption from the user 1 to the user 3 (200) and uses the respective authorization information. Digitally sign and encrypt

한편, 생성된 권한정보를 사용자 2 및 사용자 3이 백업서버(400)로부터 다운받을 수 있도록 사용자 1(200)은 사용자 2 및 사용자 3(200)에게 백업서버(400)의 주소 예컨대 URL을 사용자 2 및 사용자 3(200)에게 전송한다. 그러나 반드시 백업서버(400)의 주소를 전송해야만 하는 것은 아니고 백업서버(400)로부터 사용자 2 및 사용자 3(200)을 위한 권한정보를 사용자 1(200)이 전송받고 이를 다시 각각의 사용자 2 또는 사용자 3(200)에게 전송할 수 있다.Meanwhile, the user 1 200 sends the user 2 and the user 3 200 the address of the backup server 400, for example, the URL, so that the user 2 and the user 3 can download the generated authority information from the backup server 400. And user 3 (200). However, the address of the backup server 400 is not necessarily transmitted, and the user 1 200 receives the authorization information for the user 2 and the user 3 200 from the backup server 400, and each user 2 or the user receives them again. 3 200 may be transmitted.

한편, 사용자 2 또는 사용자 3(200)은 전송받은 권한정보를 그냥 사용할 수도 있으나 사용자 1(200)의 경우와 마찬가지로 백업서버(400)에 백업할 수도 있다. 또한 사용자 3(200)은 자신이 갖고 있는 권한정보의 한계 내에서 사용자 4를 위한 권한정보를 백업서버(400)를 통해 생성할 수 있다.Meanwhile, the user 2 or the user 3 200 may just use the received authority information but may back up to the backup server 400 as in the case of the user 1 200. In addition, the user 3 200 may generate the authority information for the user 4 through the backup server 400 within the limitation of the authority information.

한편, 사용자 1은 사용자 2 및 사용자 3(200)을 위한 권한정보 생성을 위하여 자신이 갖고 있는 재생권한 10회 중에서 8회를 사용하였으므로 현재 재생권한은 2회가 있다. 이 때 사용자 1(200)이 다시 암호화된 콘텐츠를 재생한 경우라면 백업서버(400)에는 2회의 재생권한이 백업되어 있고 현재 사용자 1(200)이 갖고 있는 재생권한은 1회이다. 이러한 불일치의 문제는 사용자 1(200)이 백업서버(400)에 접속할 때 양자의 횟수가 불일치할 때 사용자 1(200)이 갖고 있는 재생권한의 횟수를 백업서버(400)에 자동 백업되도록 하여 어느 정도 해결할 수 있다.On the other hand, since user 1 has used 8 times of 10 playback rights he has for generating authority information for user 2 and user 3 (200), there are currently 2 playback rights. At this time, if the user 1 200 reproduces the encrypted content again, the backup server 400 has two playback rights backed up, and the current user 1 200 has one playback right. The problem of such inconsistency is that when the user 1 200 accesses the backup server 400, the number of playback rights that the user 1 200 has is automatically backed up to the backup server 400 when the number of the discrepancies of the two users is different. I can solve it.

본 발명이 속하는 기술분야의 통상의 지식을 가진 자는 본 발명이 그 기술적 사상이나 필수적인 특징을 변경하지 않고서 다른 구체적인 형태로 실시될 수 있다는 것을 이해할 수 있을 것이다. 따라서 이상에서 기술한 실시예들은 모든 면에서 예시적인 것이며 한정적이 아닌 것으로 이해해야만 한다. 본 발명의 범위는 상기 상세한 설명보다는 후술하는 특허청구의 범위에 의하여 나타내어지며, 특허청구의 범위의 의미 및 범위 그리고 그 균등 개념으로부터 도출되는 모든 변경 또는 변형된 형태가 본 발명의 범위에 포함되는 것으로 해석되어야 한다.Those skilled in the art will appreciate that the present invention can be embodied in other specific forms without changing the technical spirit or essential features of the present invention. Accordingly, the embodiments described above are to be understood in all respects as illustrative and not restrictive. The scope of the present invention is indicated by the scope of the following claims rather than the detailed description, and all changes or modifications derived from the meaning and scope of the claims and the equivalent concept are included in the scope of the present invention. Should be interpreted.

본 발명에 따르면 사용자들은 자신이 갖고 있는 권한정보의 한도 내에서 권한정보를 다른 사용자와 서버의 인증과정이 없이도 공유할 수 있다.According to the present invention, users can share the authority information without the authentication process of the server with other users within the limit of the authority information they have.

또한 백업서버를 이용하여 권한정보를 백업할 수도 있으므로 그만큼 자신이 구입한 권한정보를 안전하게 사용할 수도 있고, 또 자신의 단말의 메모리나 프로세서 용량이 부족하여 권한정보 생성이 어려운 경우에 백업서버를 이용하여 이를 해결할 수 있다.In addition, the backup information can be backed up by using a backup server, so the user can use the purchased security information safely. Also, if the memory or processor capacity of his terminal is insufficient, the backup server can be used. This can be solved.

도 1은 종전에 DRM 콘텐츠 분배의 과정을 보여주는 도면이다.1 is a diagram illustrating a process of DRM content distribution.

도 2는 본 발명의 일 실시예에 따라 DRM 콘텐츠를 실행할 수 있는 권한정보를 생성하여 분배하는 과정을 보여주는 도면이다.2 is a diagram illustrating a process of generating and distributing authority information for executing DRM content according to an embodiment of the present invention.

도 3a와 도 3b는 각각 도 2의 권한정보의 문서 형식과, 구조를 보여주는 도면이다.3A and 3B are diagrams illustrating a document format and a structure of the authority information of FIG. 2, respectively.

도 4a와 도 4b는 각각 다른 사용자를 위하여 현재 소유하고 있는 권한 정보를 수정하여 생성한 권한정보의 문서형식과, 이들의 구조를 보여주는 도면이다.4A and 4B are diagrams showing document formats of authority information generated by modifying authority information currently owned for other users, and their structures.

도 5는 본 발명의 다른 실시예에 따라 DRM 콘텐츠를 실행할 수 있는 권한정보를 생성하여 분배하고 이를 관리하는 과정을 보여주는 도면이다.5 is a diagram illustrating a process of generating, distributing and managing authority information for executing DRM content according to another embodiment of the present invention.

도 6은 본 발명의 또 다른 실시예에 따라 DRM 콘텐츠를 실행할 수 있는 권한정보를 생성하여 분배하는 과정을 보여주는 도면이다.6 is a diagram illustrating a process of generating and distributing authority information for executing DRM content according to another embodiment of the present invention.

Claims (10)

권한정보 발행기관이 발급한 권한정보 또는 다른 사용자 단말로부터 전송받은 소정의 컨텐츠에 대한 권한정보를 포함하는 제1 사용자 단말이 상기 권한정보에 의한 권한 내에서 제2 사용자 단말에게 전달할 권한정보를 생성하는 단계; 및The first user terminal including the authority information issued by the authority information issuing authority or the authority information for the predetermined content received from another user terminal to generate the authority information to be delivered to the second user terminal within the authority by the authority information. step; And 상기 제1 사용자 단말이 상기 생성된 권한정보를 상기 제2 사용자 단말에게 전송하는 단계;Transmitting, by the first user terminal, the generated authority information to the second user terminal; 를 포함하는 콘텐츠에 대한 권한정보 공유방법How to Share Rights Information for Contents Including 제1항에 있어서, 상기 권한정보를 전송하기 전에 상기 제2 사용자 단말의 공개키를 이용하여 상기 권한정보를 암호화하는 단계를 더 포함하는 것을 특징으로 하는 콘텐츠에 대한 권한정보 공유방법The method of claim 1, further comprising encrypting the authority information using the public key of the second user terminal before transmitting the authority information. 제2항에 있어서, 상기 제1 사용자 단말 및 제2 사용자 단말은 상기 권한정보 발행기관에 자신이 소유하고 있는 권한정보의 한도에 대한 정보를 소정의 기간마다 전송하는 단계를 더 포함하는 것을 특징으로 하는 콘텐츠에 대한 권한정보 공유방법The method of claim 2, wherein the first user terminal and the second user terminal further comprises the step of transmitting the information on the limit of the authority information owned by the authority information issuer for each predetermined period of time. How to share permission information on the content 제1항 또는 제2항에 있어서, 상기 생성된 권한정보를 전송하기 전에 상기 제1 사용자 단말의 비밀키를 이용하여 상기 권한정보에 전자서명을 하는 단계를 더 포함하는 것을 특징으로 하는 콘텐츠에 대한 권한정보 공유방법The method of claim 1 or 2, further comprising: electronically signing the authority information by using a secret key of the first user terminal before transmitting the generated authority information. How to Share Rights Information 제4항에 있어서, 상기 제1 사용자 단말 및 제2 사용자 단말은 상기 권한정보 발행기관에 자신이 소유하고 있는 권한정보의 한도에 대한 정보를 소정의 기간마다 전송하는 단계를 더 포함하는 것을 특징으로 하는 콘텐츠에 대한 권한정보 공유방법The method of claim 4, wherein the first user terminal and the second user terminal further comprises the step of transmitting the information on the limit of the authority information owned by the authority information issuer for each predetermined period of time. How to share permission information on the content 권한정보 발행기관이 발급한 권한정보 또는 다른 사용자 단말로부터 전송받은 소정의 컨텐츠에 대한 권한정보를 포함하는 제1 사용자 단말이 상기 권한정보를 유선 또는 무선으로 연결되어 있는 백업서버에 백업하는 단계와;Backing up the authority information to a backup server connected by wire or wirelessly by a first user terminal including authority information issued by the authority information issuer or authority information about predetermined content received from another user terminal; 제1 사용자 단말이 상기 백업서버에 접속하여 상기 백업서버에서 저장되어 있는 권한정보에 의한 권한 내에서 제2 사용자 단말을 위한 권한정보를 생성하는 단계; 및A first user terminal accessing the backup server to generate the authority information for the second user terminal within the authority by the authority information stored in the backup server; And 상기 백업서버 내에 생성된 권한정보를 상기 제2 사용자 단말이 다운받을 수 있도록 상기 제2 사용자 단말에게 상기 백업서버의 주소를 전송하는 단계;Transmitting the address of the backup server to the second user terminal so that the second user terminal can download the authority information generated in the backup server; 를 포함하는 콘텐츠에 대한 권한정보 공유방법How to Share Rights Information for Contents Including 제6항에 있어서, 상기 제1 사용자 단말이 상기 제2 사용자 단말에게 상기 백업서버의 주소를 전송하기 전에 상기 백업서버는 상기 제2 사용자 단말의 공개키를 이용하여 상기 생성된 권한정보를 암호화하는 단계를 더 포함하는 것을 특징으로 하는 콘텐츠에 대한 권한정보 공유방법The method of claim 6, wherein the backup server encrypts the generated authority information by using the public key of the second user terminal before the first user terminal transmits the address of the backup server to the second user terminal. Rights information sharing method for the content, characterized in that it further comprises the step 제6항에 있어서, 상기 제1 사용자 단말 및 제2 사용자 단말은 상기 권한정보 발행기관에 자신이 소유하고 있는 권한정보의 한도에 대한 정보를 소정의 기간마다 전송하는 단계를 더 포함하는 것을 특징으로 하는 콘텐츠에 대한 권한정보 공유방법The method of claim 6, wherein the first user terminal and the second user terminal further comprises the step of transmitting the information on the limit of the authority information owned by the authority information issuer for each predetermined period of time. How to share permission information on the content 제6항 또는 제7항에 있어서, 상기 제1 사용자 단말이 상기 제2 사용자 단말에게 상기 백업서버의 주소를 전송하기 전에 상기 백업서버는 상기 제1 사용자 단말의 비밀키를 이용하여 상기 생성된 권한정보에 전자서명을 하는 단계를 더 포함하는 것을 특징으로 하는 콘텐츠에 대한 권한정보 공유방법The authority of claim 6 or 7, wherein the backup server uses the secret key of the first user terminal before the first user terminal transmits the address of the backup server to the second user terminal. Authorization information sharing method for the content, characterized in that it further comprises the step of digital signature on the information 제9항에 있어서, 상기 제1 사용자 단말 및 제2 사용자 단말은 상기 권한정보 발행기관에 자신이 소유하고 있는 권한정보의 한도에 대한 정보를 소정의 기간마다 전송하는 단계를 더 포함하는 것을 특징으로 하는 콘텐츠에 대한 권한정보 공유방법The method of claim 9, wherein the first user terminal and the second user terminal further comprises the step of transmitting the information on the limit of the authority information owned by the authority information issuer for each predetermined period of time. How to share permission information on the content
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KR10-2003-0057901A KR100493900B1 (en) 2003-08-21 2003-08-21 Method for Sharing Rights Object Between Users
JP2004222127A JP4694800B2 (en) 2003-08-21 2004-07-29 Sharing authority information for content among users
MYPI20043142A MY136409A (en) 2003-08-21 2004-08-04 Method for sharing rights objects between users
TW093123444A TWI244313B (en) 2003-08-21 2004-08-05 Method for sharing rights objects between users
SG200404786A SG109593A1 (en) 2003-08-21 2004-08-18 Method for sharing rights objects between users
RU2004125545/09A RU2295157C2 (en) 2003-08-21 2004-08-20 Method for joint usage of privilege objects between users
US10/922,021 US7734917B2 (en) 2003-08-21 2004-08-20 Method for sharing rights objects between users
DE602004018143T DE602004018143D1 (en) 2003-08-21 2004-08-20 Procedure for dividing legal objects between users
ES04255020T ES2282811T3 (en) 2003-08-21 2004-08-20 METHOD FOR SHARING OBJECTS WITH RIGHTS OF USE BETWEEN USERS.
CN2004100569165A CN1585324B (en) 2003-08-21 2004-08-20 Method for sharing rights objects between users
AT04255020T ATE357106T1 (en) 2003-08-21 2004-08-20 PROCEDURE FOR SHARING TITLE BETWEEN USERS
EP04255020A EP1509024B1 (en) 2003-08-21 2004-08-20 Method for sharing rights objects between users
EP06000766A EP1646204B1 (en) 2003-08-21 2004-08-20 Method for sharing rights objects between users
DE602004005277T DE602004005277T2 (en) 2003-08-21 2004-08-20 Procedure for legal entity sharing between users
PL04255020T PL1509024T3 (en) 2003-08-21 2004-08-20 Method for sharing rights objects between users
DK04255020T DK1509024T3 (en) 2003-08-21 2004-08-20 Procedure for sharing rights objects between users
PT04255020T PT1509024E (en) 2003-08-21 2004-08-20 Method for sharing rights objects between users
HK05105251.8A HK1072667A1 (en) 2003-08-21 2005-06-23 Method for sharing rights objects between users
US12/579,034 US8316461B2 (en) 2003-08-21 2009-10-14 Method for sharing rights objects between users
JP2010293033A JP5249314B2 (en) 2003-08-21 2010-12-28 Sharing authority information for content among users

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